try to implement profiling via CI

.gitlab-ci.yml

+image: gitlab.kwant-project.org:5005/qt/research-docker
+
+stages:
+  - run profiler
+  
+variables:
+  GIT_SUBMODULE_STRATEGY: recursive
+
+before_script:
+  - shopt -s nullglob  # sane behaviour when globs do not match
+  - pip install gitlab-ci-tools  # for last-good-build
+  - LAST_GOOD_SHA=$(last-good-build || echo '')
+
+run profiler:
+  script:
+    - pip install memray pyinstrument
+    - python profiling/graphene.py
+  stage: run profiler
\ No newline at end of file